Project description:The opportunistic pathogen A. actinomycetemcomitans (Aa) expereinces fluctuating oxygen levels in its natural habitat, the gingival crevice of the human oral cavity. Since oxygen influences metabolic interactions between Aa and other oral microbes, we sought to characterize oxygen-dependent Aa gene expression.

2014-02-01 | E-MTAB-2213 | biostudies-arrayexpress

Aggregatibacter actinomycetemcomitans strain:624

Project description:Iron and Fur gene regulation by an opportunistic pathogen

| PRJNA338057 | ENA

Effect of Catecholamines on the Dental Pathogen Aggregatibacter actinomycetemcomitans

Project description:The two-component system qseBC is a putative prokaryotic adrenergic receptor. In Aggregatibacter actinomycetemcomitans (Aa), it was shown that the qseBC responds significantly to the presence of both catecholamines and ferrous iron. In addition, growth is significantly increased in the presence of both. Therefore, we performed a custom Aa microarray in order to determine the effects of catecholamines and catecholamines and iron (CAT-Fe) on Aa. Aggregatibacter actinomycetemcomitans was grown in triplicate in a chemically defined media (CDM) supplemented with either 100uM of ferrous chloride or 50uM of norepinephrine or both. At mid-log, RNA was harvested using the Qiagen Lipid Tissue Minikit.

2015-05-12 | E-GEOD-68749 | biostudies-arrayexpress